ubuntu:video:convert_h264_to_h265
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Table of Contents
Ubuntu - Video - Convert H264 to H265
Software Encoding
ffmpeg -i a.mp4 -c:v libx265 -map 0:v -c:a copy -map 0:a -c:s copy b.mkv
Using GPU Hardware Encoding
ffmpeg -i a.mp4 -vaapi_device /dev/dri/renderD128 -vf format=nv12,hwupload -c:v hevc_vaapi -map 0:v:0 -map 0:a? -c:a copy -map 0:s? -c:s copy -rc_mode 1 -qp 25 -map_chapters 0 b.mkv ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi -map 0:a? -c:a copy -map 0:s? -c:s copy -b:a 320k -global_quality 25 k.mkv ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi b.mkv ffmpeg -threads 16 -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i a.mp4 -c:v hevc_vaapi c.mkv
NOTE: These allow the GPU to be used:
-hwaccel vaapi -hwaccel_output_format vaapi -vaapi_device /dev/dri/renderD128
Encoding formats
Try replacing scale with scale_vaapi and replace -c:v h264 with -c:v: h264_vaapi
The supported encoders are:
| H.262 / MPEG-2 part 2 | mpeg2_vaapi |
| H.264 / MPEG-4 part 10 (AVC) | h264_vaapi |
| H.265 / MPEG-H part 2 (HEVC) | hevc_vaapi |
| MJPEG / JPEG | mjpeg_vaapi |
| VP8 | vp8_vaapi |
| VP9 | vp9_vaapi |
ffmpeg -hwaccel vaapi -hwaccel_device /dev/dri/renderD128 -hwaccel_output_format vaapi -i input.mp4 -c:v hevc_vaapi -b:v 0.589M output.mp4
NOTE: I had to set the bitrate smaller because the transcoded one was even bigger than the original file.
- You can change bitrate at 0.589M
- 0.589M is 0.589 Megabytes.
- Change it accordingly to your desired bitrate. I will use 2x - 3x smaller than the orginal. In this example h.264 to hevc.
ubuntu/video/convert_h264_to_h265.1686523572.txt.gz ยท Last modified: 2023/06/11 22:46 by peter